U.S. patent application number 11/245437 was filed with the patent office on 2007-04-12 for vascular closure.
Invention is credited to Benjamin Lee.
Application Number | 20070083231 11/245437 |
Document ID | / |
Family ID | 37911847 |
Filed Date | 2007-04-12 |
United States Patent
Application |
20070083231 |
Kind Code |
A1 |
Lee; Benjamin |
April 12, 2007 |
Vascular closure
Abstract
The present invention provides a device for closing an opening
to a body cavity and methods of closing an opening to a body
cavity. The device and methods can be used to easily and
effectively close a vascular puncture site resulting from a
surgical procedure.
Inventors: |
Lee; Benjamin; (Chevy Chase,
MD) |
Correspondence
Address: |
FOLEY AND LARDNER LLP;SUITE 500
3000 K STREET NW
WASHINGTON
DC
20007
US
|
Family ID: |
37911847 |
Appl. No.: |
11/245437 |
Filed: |
October 7, 2005 |
Current U.S.
Class: |
606/213 |
Current CPC
Class: |
A61B 17/0643 20130101;
A61B 2017/0641 20130101; A61B 2017/00668 20130101; A61B 17/068
20130101; A61B 2017/00637 20130101; A61B 17/0057 20130101 |
Class at
Publication: |
606/213 |
International
Class: |
A61B 17/08 20060101
A61B017/08 |
Claims
1. A vascular closure device comprising: (a) at least two tines
including a distal end and a proximal end, wherein the at least two
tines are joined at the proximal end, and wherein the at least two
tines each have at least one barb adapted for catching tissue; and
(b) a collar with an opening receiving the proximal end of the at
least two tines; wherein the at least two tines expand radially
outward to an open position when unrestricted, and wherein the
collar can be moved from the proximal end of the at least two
resilient tines towards the distal end of the at least two tines to
radially contract the tines to a closed position.
2. The vascular closure device of claim 1, wherein the at least two
tines are biodegradable.
3. The vascular closure device of claim 1, wherein the at least two
tines are inwardly collapsible to be received into a vascular
sheath.
4. The vascular closure device of claim 1, wherein the at least two
tines are coated with a material to promote coagulation.
5. The vascular closure device of claim 1, wherein the at least two
tines are coated with a hemostatic material.
6. The vascular closure device of claim 1, wherein the at least two
tines are made from a hemostatic material.
7. The vascular closure device of claim 1, wherein the at least two
tines are coated with a material to promote tissue growth.
8. The vascular closure device of claim 1, wherein the at least two
tines are visible on an X-ray.
9. The vascular closure device of claim 1, wherein the at least two
tines are made of memory-shaped alloy material.
10. The vascular closure device of claim 1, wherein when the at
least two tines are in the open position, the at least two
resilient tines each have at least two deflections wherein both
deflections move the distal end of the tine away from the
longitudinal axis of the tines and wherein the deflection at the
distal end of the tines is greater than the deflection at the
proximal end of the tines.
11. The vascular closure device of claim 10, wherein when the at
least two tines are in the closed position, the most proximal
deflection is substantially eliminated.
12. The vascular closure device of claim 1, wherein the collar is
biodegradable.
13. The vascular closure device of claim 1, wherein the collar is
coated with a material to promote coagulation.
14. The vascular closure device of claim 1, wherein the collar is
coated with a material to promote tissue growth.
15. The vascular closure device of claim 1, wherein each tine has a
plurality of barbs adapted for catching tissue.
16. A device for closing a vascular opening or other body cavity
opening comprising: (a) at least two tines including a distal end
and a proximal end, wherein the at least two tines are joined at
the proximal end, and wherein the at least two tines each have at
least one barb adapted for catching tissue, and wherein the at
least two tines are deflected outward from the longitudinal axis of
the tines; and (b) a collar with an opening receiving the proximal
end of the at least two resilient tines; wherein the collar can be
moved from the proximal end of the at least two resilient tines
towards the distal end of the two resilient tines to radially
contract the tines thereby decreasing the deflection.
17. The vascular closure device of claim 16, wherein the at least
two tines are biodegradable.
18. The vascular closure device of claim 16, wherein the at least
two tines are inwardly collapsible to be received into a vascular
sheath.
19. The vascular closure device of claim 16, wherein the at least
two tines are coated with a material to promote coagulation.
20. The vascular closure device of claim 16, wherein the at least
two tines are coated with a hemostatic material.
21. The vascular closure device of claim 16, wherein the at least
two tines are made from a hemostatic material.
22. The vascular closure device of claim 1, wherein the at least
two tines are coated with a material to promote tissue growth.
23. The vascular closure device of claim 16, wherein the at least
two tines are visible on an X-ray.
24. The vascular closure device of claim 16, wherein the at least
two tines are made of memory-shaped alloy material.
25. The vascular closure device of claim 16, wherein when the at
least two tines are in the open position, the at least two
resilient tines each have at least two deflections wherein both
deflections move the distal end of the tine away from the
longitudinal axis of the tines and wherein the deflection at the
distal end of the tines is greater than the deflection at the
proximal end of the tines.
26. The vascular closure device of claim 25, wherein when the at
least two tines are in the closed position, the most proximal
deflection is substantially eliminated.
27. The vascular closure device of claim 16, wherein the collar is
biodegradable.
28. The vascular closure device of claim 16, wherein the collar is
coated with a material to promote coagulation.
29. The vascular closure device of claim 16, wherein the collar is
coated with a material to promote tissue growth.
30. The vascular closure device of claim 16, wherein each tine has
a plurality of barbs adapted for catching tissue.
31. A vascular closure device comprising: (a) a tube with an open
distal end; (b) a collar disposed on the distal end of the tube and
including an opening for receiving at least two tines, wherein the
collar is sized to be pushed by the tube when the tube is moved
distally, and (c) at least two tines, each of the tines inwardly
collapsible to be received in an arterial sheath and including at
least one barb adapted for grasping vascular tissue, wherein the
tines are moveably connected to the opening of the collar whereby,
when unrestricted, the tines expand radially outward to an open
position, and when the tube is moved distally, the collar is moved
distally thereby moving the tines into the opening of the collar to
radially contract the tines to a closed position.
32. The vascular closure device of claim 31, further comprising an
arterial sheath including a proximal and distal end, wherein the
tube is coaxially disposed in the arterial sheath and wherein the
at least two tines are positioned at the distal end of the arterial
sheath.
33. The vascular closure device of claim 31, wherein the collar
comprises a bioresorbable material.
34. The vascular closure device of claim 31, wherein the collar
comprises a hemostatic material.
35. The vascular closure device of claim 31, further comprising a
cord connected to the at least two resilient tines.
36. The vascular closure device of claim 35, wherein the cord
comprises a bioresorbable material.
37. The vascular closure device of claim 35, wherein the cord
comprises a standard surgical suture.
38. The vascular closure device of claim 35, wherein the cord
comprises a material selected from the group consisting of vicryl,
polydioxalone, polypropylene, nylon, silk, and steel.
39. The vascular closure device of claim 35, wherein the tines are
connected to the cable by a knot.
40. The vascular closure device of claim 35, wherein the tines are
connected to the cable by an adhesive.
41. The vascular closure device of claim 31, wherein there are at
least three tines.
42. The vascular closure device of claim 31, wherein the tines
comprise a memory-shaped alloy.
43. The vascular closure device of claim 42, wherein the
memory-shaped alloy comprises nitinol.
44. A method of closing an opening to a body cavity comprising: (a)
advancing at least two resilient tines through a body opening into
a body lumen, wherein the at least two tines each have at least one
barb adapted for catching on tissue and wherein the tines have an
open position wherein the at least two resilient tines are radially
expanded and a closed position wherein the at least two resilient
tines are radially contracted; (b) retracting the tines in the open
position against the interior tissue of the lumen, wherein the at
least one barb catches on the tissue adjacent to the body opening;
(c) radially contracting the tines to the closed position wherein
contracting pulls the edges of the tissue adjacent opening together
to close the body opening; and (d) securing the tines in the closed
position.
45. The method of claim 44, wherein the securing is performed using
a collar adapted to receive the at least two resilient tines.
46. The method of claim 45, wherein the collar is
biodegradable.
47. The method of claim 45, wherein the collar comprises a material
that promotes coagulation.
48. The method of claim 45, wherein the collar is coated with a
drug.
49. The method of claim 48, wherein the drug is an antibiotic.
50. The method of claim 44, wherein the securing is performed using
at least one suture.
51. The method of claim 44, wherein the at least two tines are
inwardly collapsible for passing through a tube.
52. The method of claim 44, wherein the at least two tines are
biodegradable.
53. The method of claim 44, wherein the at least two tines are
coated with a substance to promote coagulation.
54. The method of claim 44, wherein the at least two tines are
coated with a substance to promote tissue growth.
55. The method of claim 44, wherein the at least two tines are
coated with a drug.
56. The method of claim 55, wherein the drug is an antibiotic.
57. A method for promoting hemostasis at a vascular opening
comprising: (a) providing percutaneous access to the tissue opening
through an arterial sheath including an open distal end disposed
within the vascular lumen and an open proximal end; (b) providing
at least two tines, wherein each tine is inwardly collapsible to be
received in an arterial sheath and each tine has at least one barb
for grasping vascular tissue, wherein the tines have an open
position wherein the at least two resilient tines are radially
expanded and a closed position wherein the at least two resilient
tines are radially contracted; into the sheath; (c) advancing the
tines through the sheath and into the vascular lumen so that the
tines expand outwardly in the vascular lumen; (d) retracting the
tines so that the tines are pulled against the interior surface of
the vascular lumen, wherein the tines catch on the tissue forming
the interior surface of the vascular lumen; and (e) advancing a
collar to the exterior surface of the vascular opening, wherein the
collar causes at least two resilient tines to radially contract in
a manner to pull the edges of the vascular tissue together.
58. The method of claim 57, further comprising withdrawing the
arterial sheath.
59. The method of claim 58, wherein the withdrawing occurs after
(c).
60. The method of claim 57, wherein the collar is advanced using a
tube with the collar disposed on the distal end of the tube.
61. The method of claim 57, wherein a cord is attached to the tines
to retract the tines.
Description
BACKGROUND OF THE INVENTION
[0001] A growing number of therapeutic and diagnostic medical
procedures involve the percutaneous introduction of instrumentation
into a vein or artery. For example, in the treatment of vascular
disease, such as atherosclerosis, it is a common practice to insert
an instrument, such as a balloon, into an artery to carry out the
procedure within the artery. Although a physician may elect to use
a balloon to stretch out a vessel, he may alternatively use a laser
to burn through any plaque present and open up the artery. Also,
the physician may inject clot dissolving chemicals directly into
the blocked artery or may remove the clot directly with special
instruments. In addition, physicians often insert stents into a
vessel to keep it open. In any case a vessel is pierced in some way
to allow access to the vessel interior.
[0002] The closing and subsequent healing of the resultant vascular
puncture is critical to the successful completion of the procedure.
Traditionally, the application of external pressure to the skin
entry site, followed by patient immobility, has been employed to
stem bleeding from the wound until clotting and tissue rebuilding
have sealed the perforation. With externally-applied manual
pressure, not only is patient comfort impaired, but practitioners
are not being utilized efficiently. In the case of punctures into
femoral or superficial femoral arteries, the pressure may have to
be applied for extended periods of time for hemostasis to occur.
Additionally, a risk of hematoma exists, since bleeding from the
vessel may continue until sufficient clotting effects hemostasis.
Not only is direct pressure inefficient from both a medical and
personnel perspective, the procedure may result in substantial
reduction, if not complete arrest, of the flow of blood through the
vessel. Since thrombosis is one of the major calamities that can
occur in the post-operative period, any reduction in blood flow is
undesirable. Also, external pressure application devices may be
unsuitable for patients with substantial amounts of subcutaneous
adipose tissue, since the skin surface may be a considerable
distance from the vascular puncture site, thereby rendering skin
compression inaccurate and thus less effective.
[0003] Consequently, devices have been developed for promoting
hemostasis directly at the site of the vascular perforation. For
example, there are devices that deploy intraluminal plugs within
the vessel to close the puncture site. Another approach is to
deliver tissue adhesive or clotting agent to the perforation site.
This method may entail some risk of disadvantageously introducing
some of the adhesive or clotting agent into the bloodstream. Still
another approach is the application of pressure directly to the
perforation site. Yet another approach is where a cylindrical plug
is inserted along the shaft of a catheter segment extending from
the skin surface to the blood vessel. The catheter is then removed
so that the plug can expand as fluid is drawn into the plug from
the vessel and the surrounding tissue. Unless pressure is applied,
however, bleeding may occur around the plug into the subcutaneous
tissue. A variety of plug delivery devices are exemplified by
threaded plug pushers and multilegged channels, which install a
plug that may be resorbable.
[0004] Many of the above-noted devices rely, to varying degrees, on
tactile sensation alone to indicate to the surgeon the proper
placement of the puncture closing instrumentation, and they may
also require upstream clamping of the blood vessel to reduce
intraluminal pressure to approximately atmospheric pressure at the
puncture site. In fact, many of these techniques require a great
deal of experience and manual dexterity to use successfully. Thus,
even experienced surgeons can have difficulty in using these
techniques and devices.
[0005] Another type of percutaneous vascular hemostasis device
comprises a mechanism for delivering a suture percutaneously to a
vascular suturing site, and then tying the suture in situ. While
such devices, if properly employed, are capable of very effectively
stemming blood flow, they may require a relatively high degree of
dexterity to be operated properly. Indeed, the vessel opening is
often accessible through only small catheters making sutures even
more difficult to tie. Furthermore, the devices tend to be somewhat
complex and expensive to manufacture, and thus are not practically
employed as single use, disposable products. Consequently,
sterilization is required between uses to reduce the risk of
infection, thereby increasing their cost and inconvenience.
[0006] Accordingly, there has been a long-felt need for an
effective percutaneous vascular hemostasis device that is
relatively simple and inexpensive to manufacture and easy to use,
that does not require prohibitively precise dexterity, that is
adapted for use as disposable device, and that does not require the
introduction of a foreign substance--such as a plug, tissue
adhesive, or clotting agent--into the bloodstream. An ideal device
would exploit modern advances, but would also apply some external
pressure on the puncture site itself, which would also serve to
seal the puncture.
SUMMARY OF THE INVENTION
[0007] The present invention relates a closure device for
effectively sealing a blood vessel or other body opening, and the
structure and method of its introduction, application, and
extraction. Embodiments of the present invention require little
manual dexterity, are easy to use, and effectively seal a
perforation by using three complementary methods: using grasping
tines to appose the edges of the perforation together, folding the
edges tightly together rather than simply pulling them together,
and plugging the perforation site with a collar. Because
embodiments of the present invention use three mechanisms to
effectively seal a perforation, they provide an excellent seal and
enable faster healing. Also, because they are particularly
inexpensive to manufacture, they are especially well-suited for
one-time use, making post-surgical sterilization unnecessary, thus
cutting costs and increasing convenience.
[0008] It is an object of the present invention to fulfill one or
more of the needs referred to above. In accordance with the
principles of the present invention, this objective is obtained by
providing a device and method for closing and sealing a puncture in
a luminal wall. Embodiments of the present invention, in one
aspect, provide a reliable and easily used device for promoting and
achieving percutaneous vascular hemostasis at a perforation or
puncture site in a subcutaneous bodily lumen, especially a blood
vessel, using a combination of sealing mechanisms to promote
hemostasis in the most effective manner. In another aspect, the
present invention relates to the method of using this hemostasis
device to promote hemostasis at such a site.
[0009] In one embodiment, the present invention provides for a
closure device comprising at least two tines including a distal end
and a proximal end, wherein the tines are joined at the proximal
end, and wherein each tine has at least one barb adapted for
catching tissue; a collar with an opening receiving the proximal
end of the resilient tines; wherein the tines expand radially
outward to an open position when unrestricted, and wherein the
collar can be moved from the proximal end of the tines towards the
distal end of the tines to radially contract the tines to a closed
position.
[0010] In another embodiment, the present invention provides for a
device for closing a vascular opening or other body cavity opening
comprising: at least two tines including a distal end and a
proximal end, wherein the tines are joined at the proximal end, and
wherein the tines each have at least one barb adapted for catching
tissue, and wherein the tines are deflected outward from the
longitudinal axis of the tines; and a collar with an opening
receiving the proximal end of the tines; wherein the collar can be
moved from the proximal end of the tines towards the distal end of
the two resilient tines to radially contract the tines thereby
decreasing the deflection.
[0011] In an additional embodiment, the present invention provides
for a vascular closure device comprising a tube with an open distal
end; a collar disposed on the distal end of the tube and including
an opening for receiving at least two tines, wherein the collar is
sized to be pushed by the tube when the tube is moved distally; at
least two tines, each of the tines inwardly collapsible to be
received in an arterial sheath and with at least one barb adapted
for grasping vascular tissue, wherein the tines are moveably
connected to the opening of the collar whereby, when unrestricted,
the tines expand radially outward to an open position, and when the
tube is moved distally, the collar is moved distally thereby moving
the tines into the opening of the collar to radially contract the
tines to a closed position.
[0012] In one embodiment, the present invention provides a method
of closing an opening to a body cavity comprising advancing at
least two resilient tines through a body opening into a body lumen,
wherein the tines each have at least one barb adapted for catching
on tissue and wherein the tines have an open position wherein the
tines are radially expanded and a closed position wherein tines are
radially contracted; retracting the tines in the open position
against the interior tissue of the lumen, wherein the barb catches
on the tissue adjacent to the body opening; radially contracting
the tines to the closed position wherein contracting pulls the
edges of the tissue adjacent opening together to close the body
opening; and securing the tines in the closed position.
[0013] In another embodiment, the present invention provides a
method for promoting hemostasis at a vascular opening comprising
providing percutaneous access to the tissue opening through an
arterial sheath with an open distal end disposed within the
vascular lumen and an open proximal end; providing at least two
tines, wherein each tine is inwardly collapsible to be received in
an arterial sheath and each tine has at least one barb for grasping
vascular tissue, wherein the tines have an open position wherein
the tines are radially expanded, and a closed position wherein the
tines are radially contracted into the sheath; advancing the tines
through the sheath and into the vascular lumen so that the tines
expand outwardly in the vascular lumen; retracting the tines so
that the tines are pulled against the interior surface of the
vascular lumen, wherein the tines catch on the tissue forming the
interior surface of the vascular lumen; and advancing a collar to
the exterior surface of the vascular opening, wherein the collar
causes the tines to radially contract in a manner to pull the edges
of the vascular tissue together.
[0014] It is to be understood that both the foregoing general
description and the following detailed description are exemplary
and explanatory only, and are not restrictive of the invention as
claimed. These and other objects of the present invention will be
apparent to one of ordinary skill in the art.
BRIEF DESCRIPTION OF THE DRAWINGS
[0015] FIG. 1 shows a sectional view of a puncture site in a blood
vessel with the vascular closure device, according to an embodiment
of the present invention.
[0016] FIG. 2 shows a sectional view of a puncture site in a blood
vessel with the vascular closure device, according to an embodiment
of the present invention.
[0017] FIG. 3 shows a sectional view of a puncture site in a blood
vessel with the vascular closure device, according to an embodiment
of the present invention.
[0018] FIG. 4 shows a sectional view of a puncture site in a blood
vessel that has been closed with the vascular closure device,
according to an embodiment of the present invention.
[0019] FIG. 5 shows a internal sectional view of a puncture site in
a blood vessel.
[0020] FIG. 6 shows an internal sectional view of a puncture site
in a blood vessel in which the vascular closure device has been
inserted, according to an embodiment of the present invention.
[0021] FIG. 7 shows an internal sectional view of a puncture site
in a blood vessel that has been closed with the vascular closure
device, according to an embodiment of the present invention.
[0022] FIG. 8 shows a sectional view of a puncture site in a blood
vessel with the vascular closure device, according to an embodiment
of the present invention.
[0023] FIG. 9 shows a sectional view of a puncture site in a blood
vessel with the vascular closure device, according to an embodiment
of the present invention.
[0024] FIG. 10 shows a sectional view of a puncture site in a blood
vessel with the vascular closure device, according to an embodiment
of the present invention.
[0025] FIG. 11 shows a sectional view of a puncture site in a blood
vessel with the vascular closure device, according to an embodiment
of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
[0026] The present invention provides a reliable and easily-used
vascular closure device for closing and effectively sealing an
opening in a luminal wall, such as made during the course of a
percutaneous surgical procedure, using three complementary sealing
methods. The device comprises at least two resilient tines and a
collar. The practitioner contracts the resilient tines from an open
state to a closed state to grasp the interior edges of the opening
together and folds and apposes the edges tightly together. The
collar is then used to hold the tines in a closed positions. In
addition, the collar acts to plug the opening thereby acting as
another means of sealing the opening. Because the present invention
uses three mechanisms to effectively seal a perforation, it
provides a better seal, enables faster healing, and better promotes
and achieves percutaneous vascular hemostasis allowing earlier
ambulation and patient discharge in the most effective manner. In
addition, the use of the device requires little manual dexterity
and can therefore be used quickly and easily by even inexperienced
practitioners.
[0027] Embodiments of the present invention will be described below
with reference to the drawings.
[0028] FIG. 1 shows a vascular closure device 10, in accordance
with a first preferred embodiment of the present invention, that
may include an arterial sheath, surgical sheath, or trocar 20
deployed at a perforation or puncture site 30 in a subcutaneous
bodily lumen 40. For the purposes of the ensuing discussion, the
lumen 40 will be referred below to as a blood vessel, although the
adaptation of the present invention for use in procedures involving
other organs will readily suggest itself to those skilled in the
pertinent arts. For the purposes of the following discussion, the
term blood vessel may include veins, arteries, and similar
tissues.
[0029] The sheath 20 can be a conventional type, commonly used in
surgical procedures, and, as shown in the drawing, it is positioned
as it would be after the completion of such a surgical procedure.
Specifically, the sheath 20 may include an elongate hollow tube or
barrel 22 that is inserted through the skin 50 and subcutaneous
tissue 60, with an open internal or distal end 24 that has been
inserted into the vessel 40 through the puncture site 30. The
barrel 22 has an open external or proximal end 26 that extends from
a surgical entry site in the skin 50.
[0030] In a first preferred embodiment, the vascular closure device
10 comprises at least two tines 70 attached to a suture or wire
100, and a collar 80. More preferably, two pairs of tines 70 may be
joined at their proximal ends to the wire 100. The device may have
two, three, four, five, or more tines, whether positioned in pairs
or not. For putting the present invention into practice, a metal
alloy can be used, and one preferred embodiment would be made of a
magnesium alloy. As mentioned in U.S. Pat. No. 6,287,332, and
incorporated herein as a reference, lithium-magnesium alloys can be
used, which have a lower fatigue durability during conventional
treatment and in the body sphere. Lithium hydroxide and magnesium
hydroxide are to be expected as decomposition products, but can
both be considered non-toxic and biocompatible.
[0031] The tines 70 may be made to have a naturally open position
in which they diverge radially outwardly, and their natural
resilience causes them to return to this naturally open position if
they are squeezed together (i.e. radially inward) and then
released. This property can be achieved by using a shape memory
alloy, as described in U.S. Pat. No. 5,002,563, which is hereby
incorporated by reference. Shape memory alloys are metals that
exhibit the properties of pseudo-elasticity and shape memory
effect; they have been used in such machines as coffeepots, the
space shuttle, and thermostats, and are in use in surgical devices
such as bone plates and vascular stents. Other types of materials,
such as polymers and metals, can also be used to make the tines 70.
In fact, the tines 70 can be made of several materials, such as a
rigid material to form the body of the tines 70 and a flexible
material that can be used in appropriate places to give the tines
70 the desired shape.
[0032] The tines 70 can be joined at their proximal ends 72 using
any suitable method. For example, the tines 70 may be welded
together or joined using an adhesive. In some embodiments, the
tines 70 can be molded, so the tines 70 are formed as a single
entity joined at the proximal end 72 during manufacturing. In one
embodiment, the joined tines 70 may be in turn joined to a suture
or wire 100. In another embodiment, the tines 70 may be integral to
the wire 100.
[0033] When a suture is used, the suture 100 may be a cord made of
a bioresorbable material. Furthermore, the suture 100 may be made
of vicryl, polydioxalone, polypropylene, nylon, silk, and steel.
The tines 70 may be connected to the suture 100 by a knot or by an
adhesive.
[0034] In some embodiments, the tines 70 are joined in such a
manner that their connection is reversible, such as a bioresorbable
material. Accordingly, the joint can be designed to break at a
predetermined time, such after positioning, or the joint can be
designed to be easily broken by the practitioner at the completion
of positioning the device.
[0035] Each of the tines 70 has an inwardly-turned barb or hook 75
at the distal end of the tine. Any suitable barb design can be
employed, so long as the barb 75 is effective in attaching to or
hooking tissue. For example, the barbs 75 can be designed like the
barb on a fish hook. Other designs will be readily apparent to one
of skill in the art. The function of the barbs will be explained
below.
[0036] The device 70 also comprises a slidable locking collar 80.
The distal ends of the tines may be received in the collar 80,
which can be pushed distally over the tines 70 to lock the tines 70
in their closed position. As will be made clear from the
explanation of the operation of the device 10 as set forth below,
the tines 70 and the collar 80 advantageously can be made of a
bioresorbable material. Bioresorbable materials are well-known in
the art and can be readily selected by a skilled artisan.
[0037] A bioresorbable material is a resorbable material that is
biocompatible; biocompatible material is compatible with a living
system or living tissue, is non-toxic or non-injurious, and does
not cause immunological reaction or rejection. A number of such
materials will exhibit the requisite degree of resilience to
provide the self-opening tine function described above, such as
those described in U.S. Pat. No. 5,919,234 or U.S. Pat. No.
6,786,910, which are hereby incorporated as references. Any
appropriate biodegradable, bioerodible, or bioresorbable materials
can be used, so long as they have the desired characteristics,
including biocompatibility, flexibility, and strength. Although the
materials described in U.S. Pat. No. 5,919,234 are perforated, that
is not a requirement of the present invention. As described in U.S.
Pat. No. 6,786,910, bioresorbable refers to a structure or material
that, over time, can be at least partially removed by biological
action within the body of a subject. Bioresorbable material can
include a bioactive compound, such as a pharmaceutical composition,
a protein, a peptide, a nucleic acid molecule or a small molecule.
Such bioactive compounds preferably have desirable activities
associated with distraction procedures, such as growth factors of
various types, bone morphogenic proteins, antibiotics or other
compounds to improve or hasten the bone consolidation period or to
decrease the time of distraction. These bioactive compounds can be
leached from the bioresorbable materials over time or be released
as the biodegradable materials are removed by biological action.
The bioresorbable materials, if any, used with the present
invention should be selected based on the time needed to effect
hemostasis and wound healing. For example, if the tines are made of
a bioresorbable material, the material should not dissolve until at
least after clotting, and in some embodiments, will not dissolve
until the tissue has healed, at least partially.
[0038] The method of using the vascular closure device 10 is
illustrated in the drawings. As mentioned above, the device 10 is
used to seal an opening 30 in a blood vessel 40 or other body
opening, such as might happen as a result of a surgical procedure.
As shown in FIG. 1, the arterial sheath 20 may be first disposed at
a puncture site 30 of a blood vessel 40 so that a distal end of the
arterial sheath 20 is inserted into the interior of the blood
vessel 40. The wire 100 with tines 70 and collar 80 may be
positioned to be inserted into the proximal end 26 of the arterial
sheath 20 for insertion into the blood vessel 40.
[0039] As shown in FIG. 2, the wire 100 may be advanced within the
arterial sheath 20 placed at the puncture site 30 such that the
tines 70 are advanced into the blood vessel 40 and allowed to
expand to their open position within the blood vessel 40 from their
closed position within the arterial sheath 20. In their open
position, the tines 70 extend toward the walls of the blood vessel
40.
[0040] In the next step, which is illustrated by FIG. 3, the
arterial sheath 20 is removed, leaving the tines 70 remaining
within the interior of the blood vessel. The tines 70 are on the
distal side of the collar 80, which is situated just outside the
blood vessel 40. The collar 80 is situated over the base of the
tines 70 such that the collar 80 keeps the tines from radially
expanding into their open position.
[0041] Next, the collar 80 is moved axially with respect to the
tines 80 in the distal direction, whereby the base of the tines 70
are no longer covered such that they may radially expand into their
open position. In their open position, the tines 70 extend toward
the sides of the puncture site 30. The tines 70 are then pulled
against the interior of the puncture site 30 and the walls of the
blood vessel 40. Additionally, the collar 80 may then move axially
with respect to the tines 70 in the distal direction, whereby the
collar 80 slides back over the base of the tines 70, squeezing the
tines 70 into their closed position as they retract.
[0042] FIG. 3 shows the blood vessel 40 after the device 10 has
initially been used to close the puncture site 30 in the blood
vessel 40. As the tines 70 close toward each other, the barbs 75
grasp the surrounding tissue, appose it, and fold it together at
the puncture site 30, thereby creating an obstruction of the flow
of blood from the site 30. The device 10 remains in place, with the
tines 70 locked in a closed position by the collar 80. As shown in
FIG. 4, the wire 100 may be cut so that the device may be left in
place to hold the puncture site 30 closed. In another aspect, the
device is then resorbed, by which time the puncture site 30 has
sufficiently healed to avoid further bleeding. In another aspect,
the collar 80 need not be resorbed.
[0043] FIG. 5 shows a sectional view from within the blood vessel
40 with an open puncture site 30 before the device 10 has been
inserted. FIG. 6 illustrates a sectional view from the interior of
the blood vessel 40 after the tines 70 have been inserted through
the opening of the puncture site 30 so that the barbs 75 on the
tines 70 engage with the interior wall of the blood vessel 40. The
tines 70 are then drawn together, such as by the collar 80, causing
the puncture site 30 to be closed, as shown in FIG. 7.
[0044] In another embodiment, the tines 70 are advanced into the
vessel through a tube (such as the arterial sheath 20 or catheter
90, for example), which is inserted into the blood vessel 40. Once
advanced into the blood vessel, the tines 70 are allowed to expand
to an open position inside the vessel. In this embodiment, the
collar 80 does not keep the tines 70 in a closed position during
insertion, but instead, the shape of the tube compresses the tines
70 for insertion. Once inserted, the tines 70 can be drawn back
against the lumen interior. From this point, the tines can be
retracted to a closed position using the collar thereby sealing the
puncture site 30.
[0045] Referring to the drawings, it is apparent that the
inwardly-directed barbs 75 of the tines 70 are adapted particularly
for grabbing tissue at or closely adjacent to the interior wall
surface of the blood vessel 40, and folding the tissue of the
vessel 40 together inside the wall of the vessel 40.
[0046] Typically, the device may be left at the puncture site 30,
because in some embodiments, the materials can be selected to be
resorbed. The device can also be designed to be left in place
permanently or removed after some period of time. In some
embodiments, the collar and tines will be resorbed at different
rates. For example, the collar may be resorbed earlier than the
tines.
[0047] In another embodiment, the vascular closure device 10
comprises at least two, but preferably two pairs of, tines 70, a
collar 80, and the catheter 90 mentioned above. Use of the vascular
closure device of the second embodiment commences after a surgical
procedure that has created or exploited a puncture 30 in a blood
vessel 40. As shown in FIG. 8, an arterial sheath 20 may be placed
at the puncture site 30 and the catheter 90 may be sized such that
it may be moved coaxially with respect to, and within, the arterial
sheath 20. In this embodiment, the device 10 may include a catheter
90 to advance the suture or wire 100 and tines 70 through the
proximal end 26 of the arterial sheath 20 so that the tines 70 may
be advanced through the puncture site 30 and into the interior of
the blood vessel 40, as shown in FIG. 9. The catheter 90 generally
includes a body formed from a tube. The catheter 90 may also be
employed to advance the collar 80 through the arterial sheath 20
and along the length of the suture or wire 100 toward the proximal
end 72 of the tines 70.
[0048] A suture or wire 100 may be extended through the sheath 20
and attached to the device 10, and may be used to pull and guide
the device through the sheath 20. In another embodiment, the suture
may be used to guide the end of the catheter 90. By guiding the
distal end 92 of the catheter, the device is advanced through the
arterial sheath 20 in a collapsed state, being attached to the
distal end of the catheter 90.
[0049] The catheter 90, the collar within 80, and the tines 70, may
be advanced through the sheath 20 and into position against the
inner surface of the vessel wall 40. The tines 70 are on the distal
side of the collar 80, which is situated just outside the blood
vessel 40. The collar 80 may be situated over the base of the tines
70 such that the collar 80 keeps the tines 70 from radially
expanding into their open position. The collar 70 may be sized such
that it rests within the distal end of the catheter 90, coaxially
movable in relation to the catheter 90. At this point, the distal
end 92 of the catheter 90 and the collar 80 are disposed at the
puncture site 30, outside the opening of the puncture site 30, and
the proximal end 94 of the catheter 90 extends away from the
puncture site 30, toward, and possibly beyond, the skin 50,
depending on its length.
[0050] After the distal end 92 of the catheter 90 and the collar 80
have been placed at the opening of the puncture site 30, pressure
is placed on the proximal end 94 of the catheter 90 such that the
device is advanced past the distal end of the sheath 20 into the
interior of the blood vessel 40, such that the tines 70 are no
longer restrained and may radially expand outward into their open
position. The device is then pulled back against the tip of the
sheath 20, fully extending the tines 70. In their open position,
the tines 70 extend toward the sides of the puncture site 30. The
device and the sheath 20 are then retracted until the tines 70 make
contact with the interior of the blood vessel wall 40. As shown in
FIG. 10, the arterial sheath 20 is then removed and further tension
on the suture 100 pulls the tines 70 firmly against the vessel
wall.
[0051] The catheter 90 may then be advanced with the collar 80
located within its distal end 92. The catheter 90 is advanced until
the collar 80 slides over the base of the tines 70, further locking
them together in place. As the collar 80 forces the base of the
tines 70 together, the tines pull and fold the edges of the
puncture site 30 together. As the tines 70 close toward each other,
the barbs 75 grasp the surrounding tissue, appose it, and fold it
together at the puncture site 30, thereby creating an obstruction
of the flow of blood from the site 30. The catheter 90 is then
withdrawn from the body.
[0052] After the catheter 90 has been inserted into the arterial
sheath 20 so that the tines 70 have been advanced through the
puncture site 30, the arterial sheath may be removed, as shown in
FIG. 10. Next, the puncture site 30 may be closed by drawing the
tines 70 together. As the tines 70 close toward each other, the
barbs 75 grasp the surrounding tissue, appose it, and fold it
together at the puncture site 30, thereby creating an obstruction
of the flow of blood from the site 30. Furthermore, the collar 80
may be used to drawn the tines 70 together. This may be
accomplished by pulling the wire 100 in the direction indicated by
arrow A in FIG. 10 so that the suture or wire 100 is pulled in a
direction away from the proximal end 94 of the catheter 90. The
collar 80 may be moved in this way by advancing the catheter 90 in
the direction indicated by arrow B in FIG. 10 so that the distal
end 92 of the catheter 90 pushes the collar 80 towards the puncture
site 30 and the base of the tines 70, as further shown in FIG. 11.
Once the tines 70 have been used to close the puncture site 30 of
the blood vessel 40 the catheter 90 may be removed and the suture
or wire 100 may be cut so that the device is left to hold the
puncture site 30 closed until the site is sufficiently healed.
[0053] The addition of the catheter 90 to the device 10 allows for
additional maneuverability, control, and leverage over the
placement and manipulation of the tines 70 and collar 80. The
device, however, does not require the catheter 90 for effective
operation, and some practitioners may find that using their fingers
alone for placement enables a more accurate placement.
[0054] The tines 70 and collar 30 may act as physical obstructions
to blood leakage, working in concert with the folded luminal walls.
Hemostatic material may be placed on the collar 80 and/or the base
of the tines 70 to aid in stemming blood flow through the puncture
site 30 and to promote more effective and efficient hemostasis,
until such point as the resorbable tines 70 and collar 80 degrade
following healing. Prior to such point of degradation, the
anticoagulants on the collar 80 and the base of the tines 70 will
have worn off, and the patient's innate coagulation mechanisms will
have taken over the healing of the puncture site 30. In another
embodiment, the collar 80 and/or the base of the tines 70 may be
coated with a drug to promote healing of the puncture site and to
prevent infection. For example, the collar 80 and/or the tines 70
may be coated with an antibiotic.
[0055] The present invention also provides methods of promoting
hemostasis at a vascular opening and methods of closing an opening
to a body cavity. These methods are described with reference to the
operation of the closure device of the present invention. For
example, in one embodiment, a method of closing an opening to a
body cavity comprises advancing at least two resilient tines
through a body opening into a body lumen, wherein the at least two
tines each have at least one barb adapted for catching on tissue
and wherein the tines have an open position wherein the at least
two resilient tines are radially expanded and a closed position
wherein the at least two resilient tines are radially contracted;
retracting the tines in the open position against the interior
tissue of the lumen, wherein the at least one barb catches on the
tissue adjacent to the body opening; radially contracting the tines
to the closed position wherein contracting pulls the edges of the
tissue adjacent opening together to close the body opening; and
securing the tines in the closed position.
[0056] In another embodiment, the present invention provides a
method for promoting hemostasis at a vascular opening comprising
providing percutaneous access to the tissue opening through an
arterial sheath with an open distal end disposed within the
vascular lumen and an open proximal end; providing at least two
tines, wherein each tine is inwardly collapsible to be received in
an arterial sheath and each tine has at least one barb for grasping
vascular tissue, wherein the tines have an open position wherein
the at least two resilient tines are radially expanded and a closed
position wherein the at least two resilient tines are radially
contracted into the sheath; advancing the tines through the sheath
and into the vascular lumen so that the tines expand outwardly in
the vascular lumen; retracting the tines so that the tines are
pulled against the interior surface of the vascular lumen, wherein
the tines catch on the tissue forming the interior surface of the
vascular lumen; and advancing a collar to the exterior surface of
the vascular opening, wherein the collar causes at least two
resilient tines to radially contract in a manner to pull the edges
of the vascular tissue together.
[0057] Given the disclosure of the present invention, one versed in
the art would appreciate that there may be other embodiments and
modifications within the scope and spirit of the invention that
will suggest themselves to those skilled in the pertinent arts. For
example, the number and configuration of the tines may be altered
to suit differing surgical needs and their applications.
Accordingly, all modifications attainable by one versed in the art
from the present disclosure are to be included as further
embodiments of the present invention, and should be considered
within the spirit and scope of the present invention, as defined in
the claims that follow.
* * * * *